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A. A. TIRRILL.

ELECTRICAL REGULATING SYSTEM.

APPLICATION FILED MAY 6. I915.

lutuntcd M21) 27, 1919.

\NVENTOR /l//e/1 A f/rr/Y/ WITNESSES ATTORNEY 1; UNITED STATES PATENTOFFICE.

ELECTRICAL REGULATIN G SYSTEM.

1 305,031. Specification of Letters Patent. Patented luay 27, 1919Application filed Kay 6, 1915. Serial No. 26.304.

- To all whomz't may concern: nal is carried by a depending arm of a Beit known that I, ALLEN A. TIRRILL, a bell-crank lever 17 that is adaptedto be accitizen of the United States, and a resident tuated, inopposition to the tension of a 58 of Pittsburgh, in the county ofAllegheny spring 18, by means of an electro-magnet 6 and State ofPennsylvania, have invented a winding 19, the movements of the lever 17new and useful Improvement in Electrical being retarded by a .dash pot20. If desired, Regulating Systems, of which the following acounter-weight may be substituted for the is a specification. spr ng 18.The bell-crank lever 17 is supy invention relates to electricalreguported by, and is fulcrumed upon, the lower 10 lators, and it hasfor its object to provide a end of the depending arm of anotherbellregulator for maintaining the speed of a crank lever 21 that isactuated, in opposimotor substantially uniform. tion to the tension of aspring 22, by means It is frequently desirable to maintain subof anelectromagnet winding 23, the move stantially uniform, the speed of amotor that ments of the lever 21 being retarded by 15 is employed fordrivi paper mills and means of a dash pot 24:. The dash pot 24 similarapparatus. Suc -motors are ordiis preferably so adJusted as to afford asomenarily supplied with current from local genwhat less retardationthan the dash pot 2O erators, and, according to the present in- In orderthat the approximate regulation vention, the speed of the motor isregulated may be efi'ected by the winding 23, and the 20 by means thatare responsive both to the finer, or more accurate, regulation may bespeed of the motor and to the voltage applied effected by the winding19. t it b th g n rat r, The electromagnet windings 19 and 23 are Figure1 of the accompanying drawing connected between the terminals of theardiagrammatically illustrates a system emmature 2 of the generator and,accordingly,

26 bodying my invention, and Fig. 2 similarly receive currentproportional to the voltage illustrates a modified form of a part of theapplied by the generator to the armature 1 r gulator, of the mill motor.In circuit with the elec- In the system of Fig. .1, current isdelivtromagnet winding 23, however, is a resistor ered to the armature 1of a motor, to be 25 having a circuit in shunt thereto that is 30utilized in driving a paper mill or any other adapted to be opened andclosed by means suitable machine from the armature 2 of a of a pair ofcooperating contact terminals generator that may be driven by a motor 326 and 27 of a relay 28. An actuating elecor any other suitable primemover. Excittromagnet winding 29 for the relay 28 is ing current issupplied to the field-magnet connected in parallel with the winding 1386 windings 4 and 5, respectively, of the mill of the relay 12, and itsenergization is also motor and of the generator from an excitercontrolled by the contact terminals 15 and 6 that may be driven by themotor 3, or by 16. The electromagnetwinding 23 is. thus any othersuitable means. The exciter is continuouslyenergized in proportion tothe 90 provided with a shunt field-magnet windvoltage applied to thearmature of the mill 40 mg 7, in series with which is a regulatingmotor, though its degree of energization is resistance 8 having acircuit in shunt therecontrolled by the relay 28 in such a manner tothat is adapted to be opened and closed that it causes the contactmembers 15 and by means of coperating contact terminals 9 16 to vibrateinto and out of engagement. 96 and 10, respectively, of a relay 12. Anac- The winding 23 serves to effect the approxi- 45 tuatingelectromagnet winding 13 for the mate regulation in accordance with thevoltrelay 12 receives energizing current from the age app led to themill motor and the windexciter or from any other suit-able source. ing19 cooperating therewith, and, because The circuit of the electromagnetwinding of the adjustments of the dash pots, serves 100 13 is controlledby means of a pair of coto effect the finer or more accurate regula- 50operating contact terminals 15 and 16 which tion.

constitute parts of the main control element The contact terminal 16 ispreferably of the speed regulator. The contact termiresilientlysupported, as, for instance, by

being mounted upon a plate spring 31 that constitutes a part of one armof bell-crank lever 32. The said lever is provided with an actuatingelectromagnet winding 33 and also with a counterweight 3-1 whereby,whenthe winding 33 is not energized, the contact terminal 16 is causedto engage the terminal 15. The movements of the lever 32 are retarded!by means of a dash pot 35. The

winding 33 is supplied with energizing current from a magneto 36 that isdriven b the mill motor, 1, and that produces a v0 tage proportional tothe speed of said motor. The magneto 36 may, of course, be replaced by agenerator having a field-magnet winding and, if desired, the lever 32may be actuated mechanically in accordance with the speed of the mainmotor as, for instance, by

- .means of the common fly-ball governor, as

the relation of their characteristics being such as to provide for thisresult, and the contact terminals 15 and 16 are both caused to approacheach other, because of the decreased excitations of the coils19, 23 andment of the terminals 26 an 33. Also, when the contact terminals 26 and27 are disengaged, the winding 23 is not fully energized, and the spring22 there-' fore, causes the contact terminal 15 to engage the terminal16. When this occurs, the windings 13 and 29 become energized, and thecontact'terminals '9 and 26 engage the terminals 10 and 27,respectively. Upon engagement of the terminals 9 and'10, the resistor 8is shunted, and the generator voltage and motor speed arecorrespondingly increased, with the result that the terminals 15 and 16are moved away from each other by the actuating windings. U on engaged2?, the winding becomes fully energized, and the terminal 15 ismoved outof engagement with the terminal 16.

The'regulator continues to operate in this manner, the winding 23serving to vibrate the contact 15 into and out of engagement with theterminal 16 and, at the same time,

becauseof its continuous energization in proportion to the voltage ofthe generator,

it also serves to effect the approximate regulation. The winding 19serves to vary the distance between the contact terminals 15 and 16 inaccordance with the voltage of the generator, and its effect upon theterminal 15 'being somewhat more retarded than that of the winding 23,it serves to efiect the finer or more acurate regulation. The final andmost exact regulation is effected by the winding 33, that is energizedin proportion to the speed of the motor, the position of the terminal 16being determined by the said winding. v

I claim as my invention:

1. The combination with a generator and a motor receiving energytherefrom, of a regulator having a pair of contact terminals forregulating the excitations of the generator and the motor to decreasethe motor speed and generator voltage by reducing said excitations, theregulation being independently effected at different rates in accordancewith the motor voltage and also independently in accordance with themotor speed.

2. In an electrical regulator, the combination with two cooperatingcontact members, and three electromagnets adapted to be operated underdifferent conditions, of three levers respectively operated 'by saidelectromagnets for governing the operation of said contact members, twoof said magnets and the levers associated therewith controlling theoperation of one contact member and the third magnet and the leverassociated therewith controlling the operation of the other contactmember.

3. The combination with a motor, and a supply circuit for the motor, ofa regulator for the motor comprising two cooperating contact members,and three actuating devices for said contact members, one of saidcontact members being responsive to the speed of the motor and the othertwo devices being responsive to supply-circuit conditions.

4. The combination with a generator, a

nals for regulating the excitation of the exciter and also having twodiflerentlydamped magnet cores energized in accordance' with the motorvoltage for independently actuating one of said contact terminals and athird magnet core energized in accordance with the motor speed foractuating the other contact terminal.

5. Thecombination with a generator and a motor receiving energytherefrom, of a regulator having two cooperating contact members, andthree actuating devices for said contact members, one of said actuatingdevices being responsive to the motor speed and the other two actuatingdevices being responsive to the generator voltage.

6. The combination with a generator, a

A' I motor receiving current from the generator, and an exciterassociated with the gen-- erator and the motor,

of a regulator comprising two cooperating contact members for governingthe operation of said excit'e'r; and three actuating members,

devices for said contact one of said actuating devices being responsiveto the motor speed and two of said actuating devices being responsive,

in various degrees, to the generator voltage. 10 In testimony whereof, Ihave hereunto subscribed my name this 29th day of April,

ALLEN A. TIRRILL.

